Please help me,first time on this site and i need all the help i can get.I've got a 1982 RS1600i which im rebuilding,the problem being it will only run for a second or two using the cold start injector,there is no fuel getting to the main injectors,ive changed the metering head,pump,filter and warm up regulator but no joy,there's plenty of pressure
at the filter outlet but it just wont have it.Please help,regards matt.

 

i take it that all the ducting and pipework is in place from the metering head to the inlet manifold,if there is any leaks where air can get in between the metering head and the throttle butterfly no vacuum will be sensed by the sensing plate in the metering unit and no fuel or very little will flow to the injectors as its air flow that determins fuel flow with this set up
you could try this,take the black inlet ducting cover off the metering unit and look at the sensing plate, try lift it up but be very gentil as its a delicate piece of machinary if all is well then while holding it up fully crank over the engine with an injector pipe disconnected and see if fuel comes out,this should simulate full throttle fuel flow, but BE CAREFUL and dont set youself and the car on fire put the pipe into a container or something.

 

all ducting and pipe work is good,tried moving the plate while turning engie over but no fuel comes out.any more ideas 'cos i'm lost and close to tears.

 

ok,you need to verify that the pump is actually pumping while your turning the engine over.you should get an initial buzz for about 2 seconds when you turn the key (to only ignition lights on) for the first time,this gives an initial pressure and squirts the cold start valve if the engine temp is sufficently cold.
initial fuel pressure at the cold start valve should indicate fuel in the metering head as thats were it gets it supply,so i can only think that the pump is not spinning during cranking,
if its not, take a live feed from the battery and run it outside to the back and under were the pump is and connect it directly to the pump is supply terminal this will drive the pump continuisly. and then try and see if she starts if not verify exactly where fuel pressure is getting to
i think its a bosch k jetronic system that is fitted to your car as i dont have an rs 1600i i myself

 

thanks for replying,already tried running a feed direct to the pump but just the same,even tried it by bypassing the relay with a loop but its just the same,only running on the cold start.there is pressure everywhere on the metering head(filter in,warm up regulator supply and return,cold start inj even tank return) but not at the injector points.tried putting a pressure gauge across to see if the pump was weak but it read 100psi. bits ive changed in the process (all from scapyards) are metering head,pump and warm up regulator,the filter is new. cheers matt

 

ok matt have you disconnected the fuel injector supply pipes at the metering head or the injector itself to check for flow, or do you have them all connected and injectors out of there seats. the only thing left i can think of and something you havent changed is the injectors themselves,all be it highly unlikely the 4 of them are blocked solid,the only thing that can stop fuel getting to the injectors in the metering head is the fuel plunger inside the unit and connected to the sensor plate so the problem is there somewhere.dont know if you can but you could try connecting an injector supply to the cold start supply to see if fuel pressure is squirting out the end of each of the injectors
keep me posted and we.ll solve it somehow

 

tried disconnecting injector pipes at both the metering head and the injectors themselves,nothing comes out of the metering head so i know the injectors arent blocked,as for the plunger ,that is nice and free. stripped my original metering head down to see if the diaphragm was split but it was fine,i've run out of ideas now what to do. cheers matt

 

is the plumbing to your metering head the same as this.
i can email you a better picture if you need it

 

it looks just the same (just not as clean).going to have a good look at it tomorrow.could it be something stupid like the battery because its about had it ,i have to keep jumping it from my other car,matt

 

i just got pm from a lad who reckons the fuel plumbing at the metering head may be wrong,ie the inlet connected to the return and visa versa,mite be worth a good second look